Burglar-alarm.



No. 821,918. PATENTED-MAY 29, 1906.

A. M. ANDERSEN & H. H. AOHERSHAUG. BURGLAR ALARM.

APPLICATION FILED SEPT. 13.1905.

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ANDREW. a GRAHAM co. rncw-mnnamvuzns, WASHINGTON. D c.

UNITED STATES PATENT orrion.

ANDREW M. ANDERSEN AND HARRY H. ACHERSHAUG, OF CHICAGO,

ILLINOIS; SAID ACHERSHAUG ASSIGNOR TO SAID ANDERSEN.

BURGLAR-ALARM.

Specification of Letters Patent.

-Jcatented. May 29, 1906.

Application filed September 13. 1905- Serial No. 278,209.

This invention relates to improvements in a device to be attached to door-casings or window-sashes for the purpose of giving an alarm in an attempt to open the door or raise or lower the window-sash; and it consists in certain peculiarities of the construction, novel arrangement, and operation of the various parts thereof, as will be hereinafter more fully set forth and specifically claimed.

The object of our invention is to provide a burglar-alarm of the above-named character which shall be simple and inexpensive in construction, strong, durable, and effective inoperation, and so made that it may be applied to right or left handed doors or to either sash of a window.

Another object of the invention is to provide means for protecting the cartridge against accidental explosion.

Other objects and advantages of the invention Will be disclosed in the subjoined description and explanation.

In order to enable others skilled in the art to which our invention pertains to make and use the same, we will now proceed to describe it, referring to the accompanying drawings, in which- Figure 1 is a perspective view of a portion of a door and its frame with a burglar-alarm embodying our invention secured to the latter, showing the parts arranged as they will appear when ready for use. Fig. 2 is a similar view of a portion of a window-sash and its frame, illustrating the alarm in position on the sash with the parts arranged ready for use. Fig. 3 is a detached face view of the alarm. Fig. 4 is a plan view of a portion of the door-casing and door, showing an alarm attached to the former and illustrating by dotted lines the position the parts will occupy in the act of giving the alarm; and Fig. 5 is a detached view of the tripping device used in connection with the alarm when employed on a window-sash.

Like numerals of reference refer to corresponding parts throughout the different views of the drawings.

The reference-numeral 1O designates a pordoor, which may be of the ordinary or any preferred construction. Secured to the door casing or frame near its edge adjacent to the door and in a vertical position thereon is the alarm, which consists of a flat plate 12, of sheet metal, preferably steel, which is formed on its face with horizontally-extending projections 13, 14, and 15, each of which is provided with a circular opening, the opening in the projection 13 being for the reception of a cartridge 16 and those in the projections 14 of the firing-bolt 17, which has its upper end pointed, as shown, to strike and indent the cartridge. The projection or cartridge-holder 13 has pivotally secured thereto a disk 18, which we may sometimes use for preventing the accidental discharge of the cartridge, which may be done by turning the disk 18 to the position indicated by dotted lines in Fig. 4 of the drawings, in which position it will shield the cartridge from the pointed end of the firingbolt. Located on each side of the bolt 17 and usually about midway between the projections 14 and or bolt-holders are horizontally-extending projections 19 and 20, which are used to hold the bolt 17 in its retracted position. As shown, the bolt 17 is provided at about its middle with a laterallyextending arm 21 to engage one of the projections 1.9 or 20 and has encircling it, between said arm and the projection 15, a spiral spring 22,which when the arm 21 is released from the projections 19 or 20 will force the bolt 17 upwardly against the cartridge with great force.

By reference to the drawings and particularly to Fig. 3 thereof it will be seen and understood that the various projections forming the cartridge-holder, bolt-holder, and catches for the arm thereon are punched out of the plate 12, thus making them integral therewith, which construction affords a very simple and inexpensivedevice. The plate 12 is provided near each of its ends on opposite sides with a slot23, through which the be passed for securing the plate to the door or window-sash.

In Fig. 2 of the drawings we have illustrated the alarm secured to the sash 25 of a window, in which instance the same contion of the doorcasing, and 11 a part of the and 15 being for the reception and operation stem of a screw-eye or headed screw 24 may struction as above described will be employed; but a triangular plate 26, having on its front edge an inclined flange 27, is secured to the window-casing 28, so that when an attempt is made to raise the sash the arm 21 will be raised out of engagement with the catch or looking projection 19, thus permitting the bolt 17 to be advanced so as to strike and explode the cartridge.

It is apparent that if it is desired to use the alarm on the upper sash of a window, which may be lowered, the position of the parts V shown in Fig. 2 should be reversed. By providing the plate with a projection 19 or 20- on either side of the firing-bolt it is apparent that the device is rendered applicable to right and left handed doors or it may be applied to either side of the window-sash, for the bolt 17 may be turned so that the arm 21 thereon may engage either of said projections, thus holding the bolt in its retracted position, when by opening the door or moving the sash the arm 21 will be disengaged from its catch,

thus permiting the spring 22 to force the'bolt against the cartridge.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

A burglar-alarm consisting of a plate provided with means to secure it to a support, a plurality of alined apertured projections formed out of the plate and integral there- -with and at right angles to the same, a disk pivotally secured on the projection near one end of the plate, a spring-actuated bolt located in the other projections and having a laterally-extending arm projecting beyond the side of the plate, and a catch or looking projection formed out of the plate and integral therewith and located on each side of the bolt, substantially as described.

ANDREW M. ANDERSEN. HARRY H. AOHERSHAUG. Witnesses:

CI-IAs. C. TI LMAN, M. A. NYMAN. 

